Bosonic Spectral Function and the Electron-Phonon Interaction in HTSC Cuprates

Figure 30

Second derivative of 𝐼(𝑉) for Bi2212 tunnelling junctions for various doping: UD—underdoped; OD—optimally doped; OVD—overdoped system. The structure of minima in 𝑑²𝐼/𝑑𝑉² can be compared with the phonon density of states 𝐹(𝜔). The full and vertical lines mark the positions of the magnetic resonance energy 𝐸_𝑟≈5.4𝑇_𝑐 for various doping taken from Figure 29. Red tiny arrows mark positions of the magnetic resonance 𝐸_𝑟 in various doped systems. Dotted vertical lines mark various phonon modes. From [55].